[PATCH net] net: airoha: Disable GDM2 forwarding before configuring GDM2 loopback

[Lorenzo Bianconi]

Hw design requires to disable GDM2 forwarding before configuring GDM2
loopback in airoha_set_gdm2_loopback routine.

Fixes: 9cd451d414f6e ("net: airoha: Add loopback support for GDM2")
Tested-by: Madhur Agrawal <madhur.agrawal at airoha.com>
Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 drivers/net/ethernet/airoha/airoha_eth.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index d0c0c0ec8a80..cecd66251dba 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -1793,11 +1793,8 @@ static int airoha_set_gdm2_loopback(struct airoha_gdm_port *port)
 	u32 val, pse_port, chan;
 	int i, src_port;
 
-	/* Forward the traffic to the proper GDM port */
-	pse_port = port->id == AIROHA_GDM3_IDX ? FE_PSE_PORT_GDM3
-					       : FE_PSE_PORT_GDM4;
 	airoha_set_gdm_port_fwd_cfg(eth, REG_GDM_FWD_CFG(AIROHA_GDM2_IDX),
-				    pse_port);
+				    FE_PSE_PORT_DROP);
 	airoha_fe_clear(eth, REG_GDM_FWD_CFG(AIROHA_GDM2_IDX),
 			GDM_STRIP_CRC_MASK);
 
@@ -1815,6 +1812,11 @@ static int airoha_set_gdm2_loopback(struct airoha_gdm_port *port)
 		      GDM_SHORT_LEN_MASK | GDM_LONG_LEN_MASK,
 		      FIELD_PREP(GDM_SHORT_LEN_MASK, 60) |
 		      FIELD_PREP(GDM_LONG_LEN_MASK, AIROHA_MAX_MTU));
+	/* Forward the traffic to the proper GDM port */
+	pse_port = port->id == AIROHA_GDM3_IDX ? FE_PSE_PORT_GDM3
+					       : FE_PSE_PORT_GDM4;
+	airoha_set_gdm_port_fwd_cfg(eth, REG_GDM_FWD_CFG(AIROHA_GDM2_IDX),
+				    pse_port);
 
 	/* Disable VIP and IFC for GDM2 */
 	airoha_fe_clear(eth, REG_FE_VIP_PORT_EN, BIT(AIROHA_GDM2_IDX));

---
base-commit: dc416e32baaeb620b9809e9e25fc7b30889686e9
change-id: 20260520-airoha-disable-gdm2-fwd-cdf18f7d4f1f

Best regards,
-- 
Lorenzo Bianconi <lorenzo at kernel.org>